Boone, Crustacea, Cruise of ''Alva/' 1931 115 



teetli, the first of which is separated from the orbital angle by a de- 

 cided concavity. The anterolateral teeth are sharply defined by 

 separating grooves, the first to third teeth respectively increasing in 

 width and acuteness while the fourth is shortest and most acute. 

 There are four well separated quite convex lobules on the gastric 

 region and about four more on either side of the carapace, arranged 

 in series behind the anterolateral teeth. The male belt is five-jointed. 



The chelipeds are unequal in the male ; the carpus is rough, with 

 a strong tooth at the inner angle ; the propodus has the palm rough- 

 ened and pitted; the fingers are curved with a moderate gape and 

 have a rounded, hollowed tip, the concavity being entirely filled by 

 a curious fan-shaped tuft of setae. The fingers are blackish brown 

 with creamy tips. 



The ambulatories are subcylindrical, the upper lateral margin of 

 the merus and propodus with clusters of bristles; the dactyl stocky 

 with a curved, horny tip. 



The eyestalks are stocky, with a large cornea placed terminally. 



The antennulae are stout, fold almost transversely beneath the 

 frontal hood and are well separated by a thick interantennular 

 septum. 



The antennae have a close-fitting, obliquely placed basal article 

 that does not reach to the orbital angle ; the flagellum is quite small, 

 situated in the orbital hiatus and not half so long as the orbit. 



The external maxillipeds have the anterior margin of the merus 

 notched but have this marginal contour slightly different from that 

 of L. exaratus. 



Eeferences: Xantho crassimanus A. Milne Edwards, Ann. Soc. Ent. 

 France, ser. 4, vol. VII, p. 267, 1867.— Rathbun, Kept. U. S. 

 Fish. Comm. for 1903, Bull. 23, pt. 3, p. 847, 1906.— Edmondson, 

 Bull. B. P. Bishop Mus. vol. 5, p. 13, 1923. 



Leptodms crassimanus A. M. Edwards, Nouv. Arch. Mus. Hist. Nat., 

 ser. 2, t. IX, p. 226, pi. 11, fig. 4, 1873.— Haswell, Catal. Aus- 

 tralian Stalk and Sessile-eyed Crust., p. 61, 1882. — Muller, Verb. 

 Naturf. Ges. Basel, vol. 8, p. 474, 1886.— de Man, Archiv. fur. 

 Naturges., vol. 53, Bd. I, p. 287, 1887 ; Notes Leyden Mus., vol. 

 15, p. 284, 1893 ; Zool. Jahrb. Syst, vol. VIII, p. 522, 1894^95.— 

 NoBiLi, G., Ann. Mus. Genova, ser. 2, vol. 20, p. 257, 1899-1901.— 

 Balss, H., Denksch. Akad. Wiss. Wien, Bd. 99, p. 10, 1924. 



Xantho exaratus variety crassimanus Ortmann, Zool. Jahrb. Syst. 

 vol. 7, 448, 1893-94. 



